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Anna290100
@Anna290100
August 2022
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6 класс
Упростите выражение -0,6 (1,6 b-5)-(2,9 b-8)-4 (4-1,5b) и вычислите его значение при b=-9/13
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zhenyaM2002
Verified answer
- 0,6( 1,6b - 5 ) - ( 2,9b - 8 ) - 4( 4 - 1,5b ) = - 0,96b + 3 - 2,9b + 8 - 16 + 6b = 6b - 3,86b + 11 - 16 = 2,14b - 5
b = - 9/13
2,14 • ( - 9/13 ) - 5 = - ( 107/50 )•( 9/13 ) - 5 = - ( 963/650 ) - 5 = - 1 313/650 - 5 = - 6 313/650 br />
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zhenyaM2002
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Answers & Comments
Verified answer
- 0,6( 1,6b - 5 ) - ( 2,9b - 8 ) - 4( 4 - 1,5b ) = - 0,96b + 3 - 2,9b + 8 - 16 + 6b = 6b - 3,86b + 11 - 16 = 2,14b - 5b = - 9/13
2,14 • ( - 9/13 ) - 5 = - ( 107/50 )•( 9/13 ) - 5 = - ( 963/650 ) - 5 = - 1 313/650 - 5 = - 6 313/650 br />